A Sealing Structure for Polished Rod in Rod Production Wellhead

Abstract

The invention discloses a sealing structure for a polished rod at the head of an oil production well with a rod. A secondary sealing chamber with an internal thread is arranged in the tube hole at the lower part of the sealing connection pipe seat, and a third-stage sealing cavity is arranged in the connecting pipe at the upper part of the sealing connection pipe seat. Sealing cavity, the first-level packing installed in the first-level sealing cavity of the sealing tube seat is equipped with a pressure sleeve, and through holes are uniformly distributed on the tube wall of the pressure sleeve, and the sealing connection tube seat is threadedly connected with the sealing connection seat body , and press the primary packing through the pressure sleeve, the upper end of the pressure sleeve protruding from the primary sealing cavity matches the inner end surface of the secondary sealing cavity, and the sealing injection agent is set in the secondary sealing cavity of the sealing connection pipe seat The secondary packing is installed in the tertiary sealing cavity of the sealing connection pipe, the gland is screwed to the outer wall of the tertiary sealing cavity, and the secondary packing is pressed tightly by the spring and the pressure seat. Its structure is reasonable, combined sealing by secondary packing and injection agent, good sealing performance, good self-lubricating performance, can monitor injection agent and pressure, and reduce labor intensity of wellhead maintenance.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, and belongs to the improvement of the sealing structure of the oil production wellhead with rods, in particular to a sealing structure for the polished rod of the oil production wellhead with the rods. Background technique [0002] At present, the sealing structure of the polished rod of the domestic rod production wellhead: [0003] 1. The sealing pair is composed of polished rod and packing (rubber, sealing grease, sealant, other soft sealing materials, etc.), and the function of the packing is to directly block the downhole oil—that is, the sealing object is downhole oil Sealing structure and method design; [0004] 2. The condition of downhole oil is complex, and the composition, temperature, water content, liquid volume, pressure, and gas content change every moment, which makes the packing unable to match and effectively adapt to the downhole oil condition, resulting in freq...

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Problems solved by technology

[0004] 2. The condition of downhole oil is complex, and the composition, temperature, water content, liquid volume, pressure, and gas content change every moment, which makes the packing unable to match and effectively adapt to the downhole oil condition, resulting in frequent seal failures and pollution surroundings;

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